Spacecraft that could fuel up in orbit would be less weighed down at liftoff and fly deeper into space; making those refills happen is a big challenge ...

On Aug. 15, Katherine Schwarzenegger shared a rare glimpse at life with her family, and it featured husband Chris Pratt and dad Arnold Schwarzenegger ...

Filling in for Willie Geist, NBC’s Joe Fryer wraps up Sunday TODAY by sharing mug shots sent in by viewers. This week, Joe ...

Delaying Mars Sample Return will make the human exploration of Mars significantly more expensive and dangerous — and for the ...